EP0545492A1 - Flüssigkristall-Bildprojektionssystem mit Verringerung des Moiré-Effekts - Google Patents
Flüssigkristall-Bildprojektionssystem mit Verringerung des Moiré-Effekts Download PDFInfo
- Publication number
- EP0545492A1 EP0545492A1 EP92203688A EP92203688A EP0545492A1 EP 0545492 A1 EP0545492 A1 EP 0545492A1 EP 92203688 A EP92203688 A EP 92203688A EP 92203688 A EP92203688 A EP 92203688A EP 0545492 A1 EP0545492 A1 EP 0545492A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lcd
- projection
- extend
- image
- lcd panel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
- H04N9/3105—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133526—Lenses, e.g. microlenses or Fresnel lenses
Definitions
- the present invention relates to a LCD image projection system comprising, in this order:
- image projection system should be understood in a wide sense and comprises a device for displaying, for example, a video image, a graphic image, numerical information or a combination thereof.
- the images may be both monochrome and colour images.
- the display system may comprise three colour channels for, for example, the primary colours red, green and blue, each channel comprising a display panel.
- the direction of two sides of the LCD panel is effective parallel to the direction of the screen-lenticulars is meant that the direction of the images of these sides, formed on the projection screen by the projection lens system and optical elements between the panel and the projection lenssystem, is parallel to that of the lenticulars.
- FIG. 1 shows schematically a conventional rear projection system, i.e. a system wherein the projection screen is transmissive and the image display subsystem is arranged at one side of the screen and the audience is at the opposite side of the screen.
- an illumination subsystem represented by a lamp 101
- the LCD panel 102 is controlled to selectively block light from the lamp in patterns which create an image, for example a picture.
- Light passing through the LCD panel 102 then passes through a projection lens system represented by a single lens 103 to be focused on a projection screen 104.
- the projection screen 104 comprises vertical lenticulars which may be separated by vertical black stripes. The stripes are added to increase contrast.
- Figure 2 shows at 202 the structure of the LCD panel with the vertically and horizontally extending interpixel regions or strokes 201 and 203 respectively.
- the projection screen structure is shown with the vertically extending lenticulars and black stripes 205 and 206 respectively.
- 207 represents the apparent moiré patterns of black strokes 208 and image strokes 209. This Moiré pattern is annoying for the viewer and shades the projection image.
- image projection systems wherein a Fresnel lens structure is added to the screen, for concentrating light from the LCD panel in the audience room, the Moiré effect is increased due to the vertical patterns of the Fresnel lens.
- the object of the invention is to provide an LCD projection system with reduced moiré.
- the system according to the invention is characterized in that the interpixel regions of the LCD panel extend in a direction substantially different from said first and second directions.
- Fig. 1 shows a conversional LCD projection television.
- Fig. 2 shows how the moiré fringes arise in this conversional television.
- Fig. 3 shows how a diagonally oriented LCD matrix reduces moiré fringes.
- Fig. 4 shows a rear LCD projection TV system which has three LCD panels.
- a diagonally oriented LCD panel 302 is used in place of the vertically oriented LCD panel 202.
- the screen 204 may be according to Kokai 1-79728.
- the diagonally oriented panel 302 has LCD elements which are diamond-shaped, i.e. squares which are rotated 45° from the vertical, and the interpixel regions are diagonal.
- the apparent width of the vertical stripes is not enlarged, as will be clear when comparing the black stripes 308 of the apparent structure 303 with the black stripes 206 of the screen 204.
- diagonal is 45° from the vertical. 45° gives a minimum moiré interference.
- the LCD elements may have other shapes so long as the interpixel regions, projected on the lenticular screen, are not parallel to the lenticular.
- Fig. 4 shows an embodiment of a color projection system wherein the invention is used.
- an illumination beam b from the illumination system A comprising a lamp 401 and a reflector 400, is split in the color selective splitter 402 into three separate beams, one for each of the three colors red, green and blue.
- the three beams, of which only the chief rays b r , b g and b b are shown, are incident on three LCD panels 403, 406 and 407, forming parts of the image display subsystem B.
- Each of the three LCD panels is controlled according to the component of the respective color in the picture to be displayed.
- Light from the LCD panels 403 and 407 is routed by mirrors 404 and 405, respectively mirrors 408 and 409 to the color selective beam combining element 410.
- Light from LCD panel 406 is naturally incident on beam combining element 410.
- the three beams are then combined in the beam combining element 410.
- the combined beam b c from the beam combiner 410 which contains all the color image information, is directed to a projection lenssystem 411.
- the projection lenssystem images the three LCD's in a superposed manner on the projection screen 412.
- each LCD panel's pixels are oriented diagonally, so that none of the LCD's interpixel regions introduce moiré interference at the lenticular screen 412. While those ordinary skill in the art might devise any number of light paths for use in such a projection system, the moiré patterns will be reduced so long as the interpixel regions, as projected on the lenticular screen, are not parallel to the lenticular.
- the invention has been described for a rear projection system, it can also be used in a front projection system, i.e. a system with a reflective projection screen, wherein the projection screen has vertical lenticulars.
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mathematical Physics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Liquid Crystal (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Overhead Projectors And Projection Screens (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/801,239 US5317409A (en) | 1991-12-03 | 1991-12-03 | Projection television with LCD panel adaptation to reduce moire fringes |
US801239 | 1991-12-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0545492A1 true EP0545492A1 (de) | 1993-06-09 |
Family
ID=25180562
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92203688A Withdrawn EP0545492A1 (de) | 1991-12-03 | 1992-11-30 | Flüssigkristall-Bildprojektionssystem mit Verringerung des Moiré-Effekts |
Country Status (3)
Country | Link |
---|---|
US (1) | US5317409A (de) |
EP (1) | EP0545492A1 (de) |
JP (1) | JPH05273516A (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0833184A1 (de) * | 1996-09-30 | 1998-04-01 | Sharp Kabushiki Kaisha | Räumlicher Lichtmodulator mit horizontal überlappenden Bildelementen |
EP0833186A1 (de) * | 1995-06-08 | 1998-04-01 | Victor Company Of Japan, Limited | Flüssigkristall-Anzeigevorrichtung vom Projektionstyp |
US6801243B1 (en) | 1997-07-23 | 2004-10-05 | Koninklijke Philips Electronics N.V. | Lenticular screen adaptor |
EP1528528A2 (de) * | 2003-10-30 | 2005-05-04 | Hewlett-Packard Development Company, L.P. | Einrichtung und Verfahren zur Bilddarstellung |
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US5701185A (en) * | 1994-11-21 | 1997-12-23 | Polaroid Corporation | Spatial light modulator assembly for adapting a photographic printer to print electronic images |
US6280063B1 (en) | 1997-05-09 | 2001-08-28 | 3M Innovative Properties Company | Brightness enhancement article |
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US20050225571A1 (en) * | 2004-04-08 | 2005-10-13 | Collins David C | Generating and displaying spatially offset sub-frames |
US20050225570A1 (en) * | 2004-04-08 | 2005-10-13 | Collins David C | Generating and displaying spatially offset sub-frames |
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US20050275669A1 (en) * | 2004-06-15 | 2005-12-15 | Collins David C | Generating and displaying spatially offset sub-frames |
US7668398B2 (en) * | 2004-06-15 | 2010-02-23 | Hewlett-Packard Development Company, L.P. | Generating and displaying spatially offset sub-frames using image data with a portion converted to zero values |
US7453478B2 (en) * | 2004-07-29 | 2008-11-18 | Hewlett-Packard Development Company, L.P. | Address generation in a light modulator |
US7522177B2 (en) * | 2004-09-01 | 2009-04-21 | Hewlett-Packard Development Company, L.P. | Image display system and method |
US7453449B2 (en) * | 2004-09-23 | 2008-11-18 | Hewlett-Packard Development Company, L.P. | System and method for correcting defective pixels of a display device |
US7474319B2 (en) * | 2004-10-20 | 2009-01-06 | Hewlett-Packard Development Company, L.P. | Generating and displaying spatially offset sub-frames |
US7676113B2 (en) * | 2004-11-19 | 2010-03-09 | Hewlett-Packard Development Company, L.P. | Generating and displaying spatially offset sub-frames using a sharpening factor |
US8872869B2 (en) * | 2004-11-23 | 2014-10-28 | Hewlett-Packard Development Company, L.P. | System and method for correcting defective pixels of a display device |
US20060162198A1 (en) * | 2005-01-21 | 2006-07-27 | Dimplex North America Limited | Flame simulating assembly |
KR100677563B1 (ko) * | 2005-02-03 | 2007-02-02 | 삼성전자주식회사 | 모아레 무늬를 제거한 직시형 입체 영상 디스플레이 |
JP2006285156A (ja) * | 2005-03-08 | 2006-10-19 | Kuraray Co Ltd | 背面投写型スクリーン及び背面投写型表示装置 |
US9282335B2 (en) | 2005-03-15 | 2016-03-08 | Hewlett-Packard Development Company, L.P. | System and method for coding image frames |
US7466291B2 (en) * | 2005-03-15 | 2008-12-16 | Niranjan Damera-Venkata | Projection of overlapping single-color sub-frames onto a surface |
US7443364B2 (en) * | 2005-03-15 | 2008-10-28 | Hewlett-Packard Development Company, L.P. | Projection of overlapping sub-frames onto a surface |
WO2006129797A1 (ja) * | 2005-06-03 | 2006-12-07 | Kuraray Co., Ltd. | 背面投写型表示装置 |
US7407295B2 (en) * | 2005-07-26 | 2008-08-05 | Niranjan Damera-Venkata | Projection of overlapping sub-frames onto a surface using light sources with different spectral distributions |
US7387392B2 (en) * | 2005-09-06 | 2008-06-17 | Simon Widdowson | System and method for projecting sub-frames onto a surface |
US20070091277A1 (en) * | 2005-10-26 | 2007-04-26 | Niranjan Damera-Venkata | Luminance based multiple projector system |
US7470032B2 (en) * | 2005-10-27 | 2008-12-30 | Hewlett-Packard Development Company, L.P. | Projection of overlapping and temporally offset sub-frames onto a surface |
US20070097017A1 (en) * | 2005-11-02 | 2007-05-03 | Simon Widdowson | Generating single-color sub-frames for projection |
US7559661B2 (en) | 2005-12-09 | 2009-07-14 | Hewlett-Packard Development Company, L.P. | Image analysis for generation of image data subsets |
US20070133087A1 (en) * | 2005-12-09 | 2007-06-14 | Simon Widdowson | Generation of image data subsets |
US20070132967A1 (en) * | 2005-12-09 | 2007-06-14 | Niranjan Damera-Venkata | Generation of image data subsets |
US20070133794A1 (en) * | 2005-12-09 | 2007-06-14 | Cloutier Frank L | Projection of overlapping sub-frames onto a surface |
US20070132965A1 (en) * | 2005-12-12 | 2007-06-14 | Niranjan Damera-Venkata | System and method for displaying an image |
US7499214B2 (en) * | 2006-03-20 | 2009-03-03 | Hewlett-Packard Development Company, L.P. | Ambient light absorbing screen |
US7800628B2 (en) * | 2006-06-16 | 2010-09-21 | Hewlett-Packard Development Company, L.P. | System and method for generating scale maps |
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US7986356B2 (en) * | 2007-07-25 | 2011-07-26 | Hewlett-Packard Development Company, L.P. | System and method for determining a gamma curve of a display device |
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DE3420549C1 (de) * | 1984-05-28 | 1986-01-02 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Anordnung zur variablen bildlichen Darstellung von Formen und/oder Kurvenverläufen mittels LCD-Kristallen |
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US5146356A (en) * | 1991-02-04 | 1992-09-08 | North American Philips Corporation | Active matrix electro-optic display device with close-packed arrangement of diamond-like shaped |
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- 1992-12-01 JP JP4322004A patent/JPH05273516A/ja active Pending
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Title |
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PATENT ABSTRACTS OF JAPAN vol. 14, no. 409 (P-1101)5 September 1990 & JP-A-02 158 725 ( PIONEER ) 19 June 1990 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0833186A1 (de) * | 1995-06-08 | 1998-04-01 | Victor Company Of Japan, Limited | Flüssigkristall-Anzeigevorrichtung vom Projektionstyp |
EP0833184A1 (de) * | 1996-09-30 | 1998-04-01 | Sharp Kabushiki Kaisha | Räumlicher Lichtmodulator mit horizontal überlappenden Bildelementen |
US5953148A (en) * | 1996-09-30 | 1999-09-14 | Sharp Kabushiki Kaisha | Spatial light modulator and directional display |
US6801243B1 (en) | 1997-07-23 | 2004-10-05 | Koninklijke Philips Electronics N.V. | Lenticular screen adaptor |
EP1528528A2 (de) * | 2003-10-30 | 2005-05-04 | Hewlett-Packard Development Company, L.P. | Einrichtung und Verfahren zur Bilddarstellung |
EP1528528A3 (de) * | 2003-10-30 | 2007-08-08 | Hewlett-Packard Development Company, L.P. | Einrichtung und Verfahren zur Bilddarstellung |
Also Published As
Publication number | Publication date |
---|---|
JPH05273516A (ja) | 1993-10-22 |
US5317409A (en) | 1994-05-31 |
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